Segment Reporting and Geographic Information (Revenues by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 37,275	$ 43,170	$ 118,762	$ 128,612
Before intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	37,317	43,216	118,913	128,775
Network Equipment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	22,974	21,979	69,787	66,131
Network Integration [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	14,343	21,237	49,126	62,644
Intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ (42)	$ (46)	$ (151)	$ (163)